Last Updated: Friday, 28 December 2007, 23:14 GMT Castro again hints at retirement Acting leader Raul Castro sat next to his brother's empty seat Cuba's ailing President, Fidel Castro, has for the second time this month alluded publicly to the possibility of retiring from office. In a letter read out to Cuba's National Assembly, he said in the past he had been a person who "clung" to power, but that life had changed his perspective. Mr Castro also urged people to support his brother, acting leader Raul Castro. Last week, the 81-year-old communist leader wrote that he had a duty...